Ted-Jiang commented on PR #2580:
URL: 
https://github.com/apache/arrow-datafusion/pull/2580#issuecomment-1133628760

   > Yes, you are right @Ted-Jiang -- I was confused about the side of the join 
🤦
   > 
   > Upon more thought I think this is correct.
   > 
   > Thank you again.
   > 
   > I'll leave it open for another day or so before merging in case anyone 
else has thoughts
   
   Thanks @alamb ❤️.
   I find this rule in spark
   
https://github.com/apache/spark/blob/efe43306fcab18f076f755c81c0406ebc1a5fee9/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala#L707


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